[Mormon]

I just got done doing a compression test on my 2001 330xi with 135,xxx Miles.
The results were:
Cylinder #1:115
Cylinder #2:120
Cylinder #3:120
Cylinder #4:120
Cylinder #5:116
Cylinder #6:115

I thought that good compression was between 142-156psi for a m54, and mine is nowhere near that. So Is the engine good or bad? I had planned on supercharging my Xi, But after these results im not too sure. What would be my next best thing to do, Rebuild engine, engine swap or Sell car?

 

[jcns]

did you warm the engine before and used full throttle?

 

[Mormon]

did you warm the engine before and used full throttle?

Yep, I First pull the DME relay & fuel pump fuse.
Next, I pulled all spark plugs out. then while one person cranks with the throttle wide open the second person watched the gauge. I Cranked engine 10 times per test. Do you think I just did something Wrong?

 

[jasonbimmer]

is that a wet number or dry number?

 

[Mormon]

is that a wet number or dry number?

Its Dry

 

[lejeunebimmer]

When I did mine I got about the same number for dry, wet went up to 140's.

The big thing is to look for the variance between cyls, which yours are good!